from optparse import Option


string = "他问,你知道cba是什么单词的缩写吗?"
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option = input("请输入功能选项：\n")
    if option =='1':
        string = string.replace('','')
        print(string)
    elif option =='2':
        for i in string:
            if i ==',':
                string =string.replace(',',',')
            elif i =='.':
                string =string.replace('.','.')
            elif i =='?':
                string =string.replace('?','?')
            elif i =='?':
                string =string.replace("'","'")
        string =string
        print(string)
    elif option =='3':
        string =string.upper()
        print(string)
    elif option =='4':
        break
